Jarring tool



J. F. STEPHAN JARRING TOOL March 3, 1931.

Filed Aug. 9. 1929 I N V NT 0/? Jacn 1. 815mm.

. \ES S Patented Mar. 3, 1931 UNITED STATES JACK STEPHAN, LOS ANGELES, CALIFORNIA HARRING TOOL Application filed August 9, 1929. Serial No. 384,736.

This invention relates to a jarring tool by means of which a bit or the like can be loosened when it becomes stuck in the hole.

An object of my invention is to provide a jarring tool which may be coupled in the drilling string adjacent to the bit or the like, and which may be used during all of the drilling operations.

A further object is to provide a jarring tool which can be used toloosen the bit or the like and which can then be usedto continue the drilling without the removal of the drill pipe from the hole.

Other objects, advantages and features of invention may appear from the accompanying drawing, the subjoined detailed description and the appended claims.

In the drawing Figure 1 is a longitudinal sectional view of my jarring tool.

Figure 2 is a sectional view taken on line 22 of Figure 1.

Figure 3 is a transverse, sectional view of the slips.

Referring more particularly to the drawing, the numeral 1 indicates a threaded pin upon which the bit or the like (not shown) is screwed. A cylindrical body 2 screws on to the top of the pin 1 and a cap 3 screws on to, or is otherwise suitably coupled to the top of the body 2. A sliding mandrel 4 extends through the body 2 and cap 3 and thence downwardly into the pin 1. This body is adapted to be moved longitudinally of the tool when it is desired to jar or loosen the bit as will be further described.

A water course 5 extends longitudinally through the mandrel 4 and a wash pipe 6 screws into the bottom of the mandrel and extends downwardly through the pin 1 and thence into the tool for the purpose of conducting the circulating fluid to the tool. A packing gland 7 is provided in the pin 1 around the wash pipe 6 to prevent the fluid r from passing upwardly around the outside of the wash pipe. In the body 2 I provide a pair of slips 88 which are set in diametricallv opposed recesses 99, and the outer surfaces of the slipsv are tapered and bear against an upwardly tapered surface in the recess 9 so that the slips are tightly held against the mandrel 4. The surfaces 10-10 onthe mandrel 4 against which the slips 8 bear, are very slightly tapered so that 'a considerable strain is required to move the mandrel-upwardly past the slips 8. A. spring 11 is provided under each of the slips 8, which spring urges the slips upwardly in their respective recesses against a shoulder 12. An adjusting screw 13 extends through the body 2 and bears against a shim 13 on the slips 8 for the purpose of adjusting the slips inwardly against the surface 10 of the mandrel.

The cap 3 is formed with a'pair of elongated slots or grooves 1414, and the mandrel 4 is formed with a pair of integral lugs 15-15 which fit into the grooves 14 and are slidable therein. Thus it will be seen that the mandrel 4 may be moved longitudinally of the tool, but when the mandrel is rotated,

the entire tool including the body 2 and pin 1 are also rotated and will therefore drive the bit or other tool. A suitable coupling pin 16 is formed on the top of the mandrel 4 so that the drill pipe or the like can be coupled thereto.

In operation the drilling continues in the usual manner and after the bit becomes stuck, it may be jarred loose in the following manner. which in turn pulls the mandrel 4 upwardly and causes the surface 10 to move past the slips 8. This movement, of course, requires considerable force and as soon as the surface 10 has moved past the slips 8 the mandrel-'4 will be suddenly released and the lug 15 will strike against the top of the cap 3 thus imparting a jar to the bit. The mandrel 4 is now lowered and the small shoulders 17 at the bottom of the surface 10 will engage the The drill pipe is pulled upwardly,

v slips 8 and push them downwardly against the tension of the springs 11. When this action occurs, the slips 8 are moved outwarr lly, due to the Construction of the recesses 9 and themandrel l is returned to the position shown in Figure 1.

Thesprings 11:- immediately carry theslips 8 upwardly as soon as the shoulder 17 has, passed.- The action above stated is repeated as many times as required in order to remove the bit.-

. I Having" described my invention, I claim:

1. A jarring tool comprising a ma a} mandrel extending into the body, coupling means on the 'body'to'which a bit is adaptedto be secured, coupling means on themand'rel towhich drill pipe is adapted to be secured, means slidably mounting said mandrel in the body, said slidably mounting means being adapted and arranged to rotate the body when the mandrel is rotated and slips in said body engaging the mandrel, said slips retarding the upward movement of-the mandrel.

2.,A jarring tool comprising a body, a. mandrel'extending into the body, a cap on"- the body, said cap having'longitudinally extending grooves therein, lugs on the mandrel extending into the grooves, said lugs being adapted to rotate the body when the mandrel is rotated, and a pair of slips engaging the mandrel whereby the upward movement of the mandrel is retarded. I

3.- A jarring tool comprising a body, a

mandrel extending into the body, a cap on the body, said cap having longitudinally extending grooves therein, lugs on the mandrel extending into the grooves; .said lugs being adapted to rotate the body when'thej mandrel is rotated, and a'pair of slips'engaging the mandrel whereby the upward movement of the mandrel is :retarded, a tapered surface upon the mandrel againstwhich the slips are adapted to rest, and springs under the slips urging them upwardly." I

4. A jarring tool comprising a body,,a

- mandrel extending into the body, a cap on the body, said'cap having longitudinally ex tending grooves therein, lugs on the mandrel extending into the grooves, said lugs being adapted to rotate the body when the mandrel is rotated, and a pair of slips engaging the mandrel whereby the upward movement of the mandrel is retarded, adjusting screws extending through the body against the slips and a spring under each of the slips urging thesame upwardly.

5. A jarring tool comprising a body, a i' screwed into the bottom of the body, a cap serewed on to the top of the body, a mandrel extending through the cap, and-body, said cap having grooves formed therein, .lugs on the mandrel extending into'the grooves, said lugs being adapted and arranged to rotate the body when the mandrel is'r'o'tated, awash i 

